<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>0.7$set的实现</title>
</head>
<script src="./index.js"></script>
<body>
    
</body>
</html>
<script>
    let vm = new Vue({
        data: {
            userName: '蒋皓天'
        }
    })

    console.log('vue实例：', vm);
</script>